Anyone had a SD memory card go bad?

Suddenly my Kodak digital started having problems with the SD card in it and worked fine without it. I then bought a new 512MB and it works fine. The original "bad" one worked fine in a card reader though.

How am I to tell if the camera of SD card are bad? Do SD cards die after a year?

I actually had a Sandisk SD card that after about 3 months would not allow me to format it in my memory reader, Dell Axim or my camera. I sent it back and they sent me a new one. My memory reader still did not like it but it worked fine in the Axim. So I bought a PNY SD card and it worked great in the camera and memory reader. So yes I have seen one go bad and I was very careful with it and it had no physical damage.